Gaia17bpp
Gaia17bpp is a rare M-type Red giant star that exhibited a single large dimming event (G-16-20.5 mag) over 6.5 years. The variable star is located in the constellation of Sagitta roughly 27,600 ly (8.5 kpc).[1] Current hypothesis and archival data suggest that Gaia17bpp belongs to a rare family of ultra-long period binary stars where the companion is enshrouded in large optically thick disks reminiscent of Epsilon Aurigae, VVV-WIT-07, and AS Leonis Minoris.[1] The proposed secondary star and disk remain unconfirmed due to the copious amount of intervening interstellar dust, and likely due to the remarkable long timescale period of the system.
Gaia17bpp-artist Optical image of Gaia17bpp | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagitta |
| Right ascension | 19h 37m 23.16s[2] |
| Declination | +17° 59′ 02.90″[2] |
| Characteristics | |
| Astrometry | |
| Parallax (π) | −0.18±0.4 mas. Derived distance using photogeometric distance posterior distribution (Bailer-Jones et al. 2021) |
| Other designations | |
| AT 2017exj 2MASS J19372316+1759029 | |
| Database references | |
| SIMBAD | J19372316+1759029 data |
- ^ a b Tzanidakis, Anastasios; Davenport, James R. A.; Bellm, Eric C.; Wang, Yuankun (2023-09-01). "Gaia17bpp: A Giant Star with the Deepest and Longest Known Dimming Event". The Astrophysical Journal. 955 (1): 69. doi:10.3847/1538-4357/aceda7. ISSN 0004-637X.
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